<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      header,
      nav {
        height: 120px;
        width: 800px;
        background-color: pink;
        border-radius: 15px;
        margin: 15px auto;
      }
    </style>
    <header>头部区域</header>
    <nav>导航栏区域</nav>
  </head>
</html>
